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There is a round sight glass on the right side of the motor down low, near the front - you'll probably have to get on your hands and knees to see it. The bike must be held up vertically (not on the side stand) so you'll need someone to hold the bike up. It should also be level front to back and the oil level should be at about the halfway point between the top and bottom of the glass. Oil type recommended by Yamaha is SAE20W40. The site www.venturerider.org is a good resource for information on the Royal Star bikes. Be sure not to use automobile oil as most of those have "energy conserving" additives that will quickly ruin your clutch!! Stay with motorcycle specific oils to be on the safe side.

if a four cycle engine I would say either you have a lot of work ahead or engine replacement. The only way to find out is boroscope the cylinder to see for piston damage. or total teardown for rod damage. I think you blew it up.

its correct but we can maintan it regular sevice and 15to25 oil level checkups chain cover r not given beacuse its new model bike na u also check chain sproket oil evey 10to15days som free ness become strating starting come medium speed slowly take speed than be strain less you riding also happy

Motorcycles and cars are designed so you can't over rev the engines in high gear. Air resistance will keep your speed low enough so the engine can't over rev. However, in a lower gear, you CAN over rev. If you don't have a tachometer on the bike, read your owners manual for suggested top speed in each gear. Or do a Google search for your bike and and "speed" and "gear".

Yes, it is possible. This has happened to others through the years and the problem is usually caused by a lack of oil and oil filter changes. Dirty oil can plug up the oil system and cause the bike to seize.

More than likely the majority of the problem is related to poor compression pressure. When was the last time the engine was re-built (a new top end)?

I would suggest evaluating the condition of the piston, ring and cylinder. Replacing the piston and ring and won't set you back much if the bore in the cylinder is good and it will definately perk your bike back up.

Clean that air filter too - a plugged filter will cause the bike to run rich, too.